EP0155975A1 - Cooling apparatus for dot matrix impact print head - Google Patents
Cooling apparatus for dot matrix impact print head Download PDFInfo
- Publication number
- EP0155975A1 EP0155975A1 EP84103273A EP84103273A EP0155975A1 EP 0155975 A1 EP0155975 A1 EP 0155975A1 EP 84103273 A EP84103273 A EP 84103273A EP 84103273 A EP84103273 A EP 84103273A EP 0155975 A1 EP0155975 A1 EP 0155975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- print head
- inlet
- container
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/377—Cooling or ventilating arrangements
Definitions
- the invention relates to a cooling apparatus for dot matrix impact print head of the kind used in dot matrix serial printers.
- the print head includes a set of printing needles or equivalent elements, which are energized by a corresponding set of electromagnets, to transfer, by inpact pressure, the pigment of an inked ribbon to the printing support.
- Heat dissipation is usually obtained by thermal exchange with the air surrounding the print head owing to the difference in temperature which arises between the print head body and the surrounding air.
- ther mal sensors are used, which senses the temperature in the printing head and which inhibit its further operation when a preestablished temperature ceiling is reached.
- the heating problem becomes further crucial in those printers where, in order ro reduce the noise caused by the electromagnet operation the whole print head is enclosed in a noise deadening material which grea tly reduces the thermal conductivity of the print head body and substantially causes the thermal isolation of the print head.
- Sane form of indirect cooling may be foreseen to overcome such problem.
- liquid cooling is much more efficient than air cooling, but for its effectiveness a complex and relatively expensive apparatus is required, involving the use of a pump, and heat radiators.
- the invention originates from the simple consideration that the print head, when in operation, is affected by a reciprocating move ment along the print line and that such movement can be used to induce a relative displacement of a fluid surrounding the printing head, due to the fluid inertia.
- the print head itself may be used as a pumping element.
- a second consideration is that the guiding bars, already provided for guiding the print head in its reciprocating movement can be used as coolers.
- the guiding bars may substitute for any additional and cost increasing heat radiator.
- the platen or sane suitable portion of the printer frame may also be used as heat radiator.
- a serial printer frame as the one shown, con sists of a base plate 1, two side plates 2, 3, two parallel cylindrical bars 4, 5 fixelly mounted between the side plates, and a platen 6.
- the platen may be either in the form of a cylindrical drum; rotatably mounted between the side plates, or a prismatic bar fixedly mounted between the side plates, as shown in Fig. 1.
- a carriage 7 is slidably mounted on the guiding bars 4, 5 and coupled by transmission means, not shown, to a motor.
- the carriage 7 may be moved along the bars 4, 5 in both direction in a reciprocating movement.
- a print head is fixedly mounted on carriage 7.
- the print head is basically composed of a needle guiding group in form of a nose 8 and an electromagnet group 9.
- the print head mounted thereto traverses a printing support, not shown, laid down onto the platen, so that by suitable and selective energization of the electro magnets in the print head, the needles are selectively actuated to per form dot impression on the printing support.
- US Pat. 4,260,270 is exemplary of a dot matrix printing head structure and the European Patent Application published with N. 58901 shows a preferred embodiment of electromagnet assembly for dot matrix printing head.
- the electromagnet group 9 is surrounded by a toroidal body 10 in thermally conductive contact with the electroma gnet group 9 and preferably in direct thermally conductive contact with sane portion of the electromagnet cores.
- the toroidal body 10 is hollow.
- the body 10 has an inlet 11 to the cavity and an outlet 12.
- Guiding bar 4 is hollow and its cavity 14 has an inlet 15 and an outlet 16.
- a flexible, plastic or rubber conduit 17 connect the inlet 11 to the outlet 16 and a flexible, plastic or rubber conduit 18 connects the out let 12 to the inlet 15, so that a circulation loop for a fluid is obtained.
- the cavity in body 10, the bar cavity 14 and the conduits 17,18 are fil led with refrigerating liquid, preferably a non electrically conductive liquid, such as oil.
- Inlet 11 is provided, as more clearly shown in fig. 2 with a no return or unidirectional stop valve, so that liquid may flow from conduit 17 into the body 10, not viceversa.
- Bar 4 is usually a steel bar, and therefore it is characterized by a high thermal conductivity.
- F ig. 2 shows in exploded view two preferred forms of embodiment of the hollow toroidal body 10, in the first form the body 10 being integral to the electromagnet group 9.
- electromagnet assembly where the individual electromagnet cores and related energization coils of a prin ting head are englobed, by a molding process, in heat hardened plastic forming a unitary assembly.
- Such assembly is shown as B in Fig. 2.
- Assembly B is essentially shaped as a cylindrical plastic body 19 provi ded with a central cylindrical opening 20 and with a toroidal neck 21 having a diameter rather greater than the one of cylindrical body 19.
- the cores of the electromagnets are radially and uniformly arranged with in the plastic assembly with bare portions of the cores protruding from the outer cylindrical surface of the body.
- Cap A in form of cylindrical bushing has inner diameter equal to the diameter of neck 21.
- the bushing is provided with a toroidal neck 22 projecting inwardly and having a diameter equal to the diameter of cylin drical body 19.
- Bushing A is further provided with an input pipe fitting 24 and related inlet opening 25 and with an output pipe fitting 26 and related outlet opening 27.
- Unidirectional stop valve is formed at inlet 25 by means of flexible plastic or rubber tongue 28 fixed by its upper portion 29 to the inner wall of cap A.
- Cap A is inserted on assembly B so as to form, together with assembly B the toroidal hollow body 10 of fig. 1
- cap A is bounded to assembly B by glueing, thermocompression or any other suitable means which may provide a sealing of the. recess so formed, thereafter to be filled with liquid.
- the body so formed provides for an optimized thermal transfer between the heat source and the cooling liquid because the liquid is in direct contact with the cores.
- the body so formed has the disadvantage that being integral to the electromagnet assembly, hence integral to the print head, removal of the print head from the printer for replacement, repair or maintenance, is not possible without draining of the liquid in the apparatus.
- hollow body 10 may be obtained by combination of cap A with a bush as the one shown by C in Fig. 2.
- Bush C preferably in thermally conductive material such as aluminium or plastic with metallic filler substitutes for the electromagnet assembly B.
- bush C shown as a hollow cylinder, may be suita bly arranged for establishing a good mechanical contact with the elements from which heat has to be drained, at to which it may be fastened in removable way.
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Impact Printers (AREA)
Abstract
Description
- The invention relates to a cooling apparatus for dot matrix impact print head of the kind used in dot matrix serial printers.
- It is known that in dot matrix serial printers a printing head sli- dally mounted on guiding bars is moved along a print line in front of and trasverse to a print support to perform printing thereon.
- The print head includes a set of printing needles or equivalent elements, which are energized by a corresponding set of electromagnets, to transfer, by inpact pressure, the pigment of an inked ribbon to the printing support.
- In spite of the several improvements which have been adopted in the art to increase the efficiency of the electromagnets, most of the elec trical power supplied to the electromagnetic actuators, is not conver ted in printing work, but it is wasted in hysteresis losses within the magnetic materials forming the electromagnet cores and in resistive losses within the electromagnet coils.
- These losses develop heat which must be dissipated.
- Heat dissipation is usually obtained by thermal exchange with the air surrounding the print head owing to the difference in temperature which arises between the print head body and the surrounding air.
- To improve the thermal exchange and to limit the thermal step between air and print head cooling elements are often used which by means of finger or wing shaped portions, increase the thermal exchange surface. The print head movement is further exploited to increase the thermal transfer, and in some cases air flow is further induced by fans.
- In spite of these expedient, print head overheating is often a problem expecially in case of high speed printing heads which problem is not completely overcome.
- Thus in order to prevent print head damages, in several printers, ther mal sensors are used, which senses the temperature in the printing head and which inhibit its further operation when a preestablished temperature ceiling is reached.
- The heating problem becomes further crucial in those printers where, in order ro reduce the noise caused by the electromagnet operation the whole print head is enclosed in a noise deadening material which grea tly reduces the thermal conductivity of the print head body and substantially causes the thermal isolation of the print head.
- Sane form of indirect cooling may be foreseen to overcome such problem. For instance liquid cooling is much more efficient than air cooling, but for its effectiveness a complex and relatively expensive apparatus is required, involving the use of a pump, and heat radiators.
- As far as it is known, no attempts have been made in this direction. The invention, as claimed. is intended to remedy these drawbacks.
- It solves the problem of how to provide liquid cooling of a print head with very simple and unexpensive means.
- Basically the invention originates from the simple consideration that the print head, when in operation, is affected by a reciprocating move ment along the print line and that such movement can be used to induce a relative displacement of a fluid surrounding the printing head, due to the fluid inertia.
- Thus the print head itself may be used as a pumping element.
- A second consideration is that the guiding bars, already provided for guiding the print head in its reciprocating movement can be used as coolers.
- In fact they are usually made by steel and inherently have an high thermal conductivity.
- Thus the guiding bars may substitute for any additional and cost increasing heat radiator.
- In case the platen or sane suitable portion of the printer frame may also be used as heat radiator.
- Therefore the invention, as claimed, may be carried out by suitable and unexpensive modification of elements already existing in serial printers, with the sole addition of unexpensive fluid conduits.
- The feature and the advantages of the invention will appear more clear ly from the following description of a preferred embodiment and from the attached drawings wherein:
- Figure 1 is a perspective view of a serial printer frame including the cooling apparatus of the invention.
- Figure 2 is a perspective exploded view of a printing head portion, suitably modified in accordance with the invention.
- With reference to Fig. 1, a serial printer frame as the one shown, con sists of a base plate 1, two
side plates 2, 3, two parallelcylindrical bars 4, 5 fixelly mounted between the side plates, and aplaten 6. The platen may be either in the form of a cylindrical drum; rotatably mounted between the side plates, or a prismatic bar fixedly mounted between the side plates, as shown in Fig. 1. - A carriage 7 is slidably mounted on the guiding
bars 4, 5 and coupled by transmission means, not shown, to a motor. - By suitable energization of the motor the carriage 7 may be moved along the
bars 4, 5 in both direction in a reciprocating movement. - A print head is fixedly mounted on carriage 7.
- As known, the print head is basically composed of a needle guiding group in form of a
nose 8 and anelectromagnet group 9. - When the carriage moves along the guiding bars, the print head mounted thereto traverses a printing support, not shown, laid down onto the platen, so that by suitable and selective energization of the electro magnets in the print head, the needles are selectively actuated to per form dot impression on the printing support.
- In order to understand the invention no further details are required as to the structure of the dot matrix printer, which details may be ea sily found in the literature.
- As to the print head, US Pat. 4,260,270 is exemplary of a dot matrix printing head structure and the European Patent Application published with N. 58901 shows a preferred embodiment of electromagnet assembly for dot matrix printing head.
- When the electromagnets in the
electromagnet group 9 are energized, hystereses losses, eddy current losses and resistive losses occur so that theelectromagnet group 9 may be taken as a source of heat which must be dissipated. - According to the invention the
electromagnet group 9 is surrounded by atoroidal body 10 in thermally conductive contact with theelectroma gnet group 9 and preferably in direct thermally conductive contact with sane portion of the electromagnet cores. - As it is more clearly shown in fig. 2 the
toroidal body 10 is hollow. Thebody 10 has aninlet 11 to the cavity and anoutlet 12. - Guiding bar 4, too, is hollow and its
cavity 14 has aninlet 15 and anoutlet 16. - A flexible, plastic or
rubber conduit 17 connect theinlet 11 to theoutlet 16 and a flexible, plastic orrubber conduit 18 connects the outlet 12 to theinlet 15, so that a circulation loop for a fluid is obtained. - The cavity in
body 10, thebar cavity 14 and theconduits -
Inlet 11 is provided, as more clearly shown in fig. 2 with a no return or unidirectional stop valve, so that liquid may flow fromconduit 17 into thebody 10, not viceversa. - It is clear that when the print head is accelerated from the right side of the printer frame, as shown in Fig. 1, to the left side, the liquid contained in
body 10 cavity, due to its inertia, is partially drained inconduit 18 and the liquid contained inconduit 17 is partially suctioned in thebody 10 cavity to replace the same liquid amount which left the cavity. - In this way a fluid flow is established in the fluid loop.
- When the print head is decelerated to stop at the left side of the printer frame, the reverse fluid flow is prevented by the unidirectio nal stop valve provided in the loop.
- In the same way, when the print head is accelerated from the left side to the right side of the printer, no reverse fluid occurs, and a direct fluid flow occurs when the print head is decelerated to stop at the right side of the printer frame.
- It is therefore clear that heat developed in the electromagnet group is transferred by thermal conductivity to the liquid in the hollow body 1Q and it is taken out from the
hollow body 10 and brought intocavity 14 of bar 4 thanks to the liquid flow in the path. - Even assuming that
body 10 andconduits - Moreover, it offers a broad surface for thermal exchange with the sur rounding air, and further being placed in an horizontal position, indu ces air convective flow along its full length, which flow enhances the thermal exchange.
- Fig. 2 shows in exploded view two preferred forms of embodiment of the hollow
toroidal body 10, in the first form thebody 10 being integral to theelectromagnet group 9. - The already mentioned european patent application published with n 58901 discloses a preferred embodiment of electromagnet assembly where the individual electromagnet cores and related energization coils of a prin ting head are englobed, by a molding process, in heat hardened plastic forming a unitary assembly. Such assembly is shown as B in Fig. 2. Assembly B is essentially shaped as a cylindrical plastic body 19 provi ded with a central
cylindrical opening 20 and with atoroidal neck 21 having a diameter rather greater than the one of cylindrical body 19. The cores of the electromagnets are radially and uniformly arranged with in the plastic assembly with bare portions of the cores protruding from the outer cylindrical surface of the body. This kind of assembly may be used to obtain ahollow body 10 integral thereto. To this purpose it suffices to have a plastic molded cap, as the one shown as A in Fig. 2. Cap A in form of cylindrical bushing, has inner diameter equal to the diameter ofneck 21. The bushing is provided with atoroidal neck 22 projecting inwardly and having a diameter equal to the diameter of cylin drical body 19. - Toroidal neck=22 is provided with
suitable indentations 23, mating that portion of the cores which protrude from body 19. - Bushing A is further provided with an input pipe fitting 24 and related inlet opening 25 and with an output pipe fitting 26 and related outlet opening 27.
- Unidirectional stop valve is formed at
inlet 25 by means of flexible plastic orrubber tongue 28 fixed by itsupper portion 29 to the inner wall of cap A. - Cap A is inserted on assembly B so as to form, together with assembly B the toroidal
hollow body 10 of fig. 1 - Obviously cap A is bounded to assembly B by glueing, thermocompression or any other suitable means which may provide a sealing of the. recess so formed, thereafter to be filled with liquid.
- It is clear that the body so formed provides for an optimized thermal transfer between the heat source and the cooling liquid because the liquid is in direct contact with the cores.
- Whilst simple, unexpensive and efficient, the body so formed has the disadvantage that being integral to the electromagnet assembly, hence integral to the print head, removal of the print head from the printer for replacement, repair or maintenance, is not possible without draining of the liquid in the apparatus.
- Moreover, in case the electromagnet assembly is not englobed in a unitary assembly a sealed recess cannot be obtained by the mere use of a cap as the one shown in Fig. 2.
- As an alternative embodiment,
hollow body 10 may be obtained by combination of cap A with a bush as the one shown by C in Fig. 2. - Bush C, preferably in thermally conductive material such as aluminium or plastic with metallic filler substitutes for the electromagnet assembly B.
- The shape and size of bush C, shown as a hollow cylinder, may be suita bly arranged for establishing a good mechanical contact with the elements from which heat has to be drained, at to which it may be fastened in removable way.
- With this alternative embodiment it is clear that removal of the print head from the printer does not require draining of the cooling apparatus.
- It is clear that the cooling apparatus described in connection with figures 1 and 2 is only a preferred embodiment of the invention and that several changes can be made without departing from the scope of the invention.
- In particular:
- - The liquid containing body shown generically as a collar surrounding the print head may have any form and disposition as to the printing head, provided good thermal conductivity is established between the liquid containing body and the heat source.
- - The unidirectional valve, may be located everywhere in the fluid loop.
- - As a heat radiator, it is possible to use both guiding
bars 4, 5 as well asplaten 6 or other frame elements, in series or parallel each other, provided such elements are made hollow or, if so preferred, a heat radiator other than a functional and already existing element of the printer may be provided.
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8484103273T DE3466959D1 (en) | 1984-03-24 | 1984-03-24 | Cooling apparatus for dot matrix impact print head |
EP84103273A EP0155975B1 (en) | 1984-03-24 | 1984-03-24 | Cooling apparatus for dot matrix impact print head |
US06/703,072 US4579469A (en) | 1984-03-24 | 1985-02-19 | Cooling apparatus for dot matrix printing head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84103273A EP0155975B1 (en) | 1984-03-24 | 1984-03-24 | Cooling apparatus for dot matrix impact print head |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0155975A1 true EP0155975A1 (en) | 1985-10-02 |
EP0155975B1 EP0155975B1 (en) | 1987-10-28 |
Family
ID=8191845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84103273A Expired EP0155975B1 (en) | 1984-03-24 | 1984-03-24 | Cooling apparatus for dot matrix impact print head |
Country Status (3)
Country | Link |
---|---|
US (1) | US4579469A (en) |
EP (1) | EP0155975B1 (en) |
DE (1) | DE3466959D1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0218205A1 (en) * | 1985-10-08 | 1987-04-15 | Kabushiki Kaisha Sato | Thermal printer |
GB2186842A (en) * | 1986-02-19 | 1987-08-26 | Dataproducts Corp | Cooling assembly for impact printer hammer bank |
DE3840495A1 (en) * | 1987-12-11 | 1989-06-29 | Diesel Kiki Co | COOLING DEVICE FOR A PRINTER HEAD |
DE4036090A1 (en) * | 1990-11-13 | 1992-05-14 | Nec Deutschland | Printer with air cooling - has flap elements on head to form flow path for air |
EP0550190A2 (en) * | 1991-12-30 | 1993-07-07 | Xerox Corporation | Thermal control system for multiple print bar system |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4797837A (en) * | 1986-04-24 | 1989-01-10 | Ncr Canada Ltd. - Ncr Canada Ltee | Method and apparatus for thermal printer temperature control |
US5017941A (en) * | 1989-11-06 | 1991-05-21 | Xerox Corporation | Thermal ink jet printhead with recirculating cooling system |
US5272491A (en) * | 1990-10-31 | 1993-12-21 | Hewlett-Packard Company | Thermal ink jet print device having phase change cooling |
EP0484034A1 (en) * | 1990-10-31 | 1992-05-06 | Hewlett-Packard Company | Thermal ink jet print device having phase change cooling |
US5211493A (en) * | 1992-06-05 | 1993-05-18 | Eastman Kodak Company | Cooling system for a thermal printing head |
US6767079B1 (en) * | 2003-01-15 | 2004-07-27 | Xerox Corporation | Low cost high performance thermal ink jet printhead |
JP2024032170A (en) * | 2022-08-29 | 2024-03-12 | エスアイアイ・プリンテック株式会社 | Liquid jet head, liquid jet recording device, and manufacturing method for liquid jet head |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5722070A (en) * | 1980-07-15 | 1982-02-04 | Oki Electric Ind Co Ltd | Cooling device for printer |
JPS57187272A (en) * | 1981-05-14 | 1982-11-17 | Shuichi Sakai | Dot needle for writing |
JPS5829691A (en) * | 1981-08-18 | 1983-02-21 | Fujitsu Ltd | Cooling fan |
JPS5842483A (en) * | 1981-09-08 | 1983-03-11 | Toshiba Corp | Cooler for printing head |
JPS57131587A (en) * | 1982-01-06 | 1982-08-14 | Toshiba Corp | Cooling device for printer |
-
1984
- 1984-03-24 EP EP84103273A patent/EP0155975B1/en not_active Expired
- 1984-03-24 DE DE8484103273T patent/DE3466959D1/en not_active Expired
-
1985
- 1985-02-19 US US06/703,072 patent/US4579469A/en not_active Expired - Fee Related
Non-Patent Citations (3)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 128 (M-31)[610], 9th September 1980; & JP-A-55 086 772 (SUWA SEIKOSHA K.K.) 30-06-1980 * |
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 163 (M-152)[1041], 26th August 1982; & JP-A-57 080 068 (HITACHI SEISAKUSHO K.K.) 19-05-1982 * |
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 83 (M-130)[961], 21st May 1982; & JP-A-57 022 070 (OKI DENKI KOGYO K.K.) 04-02-1982 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0218205A1 (en) * | 1985-10-08 | 1987-04-15 | Kabushiki Kaisha Sato | Thermal printer |
GB2186842A (en) * | 1986-02-19 | 1987-08-26 | Dataproducts Corp | Cooling assembly for impact printer hammer bank |
GB2186842B (en) * | 1986-02-19 | 1990-08-01 | Dataproducts Corp | Impact printer |
DE3840495A1 (en) * | 1987-12-11 | 1989-06-29 | Diesel Kiki Co | COOLING DEVICE FOR A PRINTER HEAD |
DE4036090A1 (en) * | 1990-11-13 | 1992-05-14 | Nec Deutschland | Printer with air cooling - has flap elements on head to form flow path for air |
EP0550190A2 (en) * | 1991-12-30 | 1993-07-07 | Xerox Corporation | Thermal control system for multiple print bar system |
EP0550190A3 (en) * | 1991-12-30 | 1994-03-16 | Xerox Corp |
Also Published As
Publication number | Publication date |
---|---|
US4579469A (en) | 1986-04-01 |
EP0155975B1 (en) | 1987-10-28 |
DE3466959D1 (en) | 1987-12-03 |
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